I think Epirus will be the most interesting faction to begin with.
272 BC is actually the year its best leader, Pyrrhus, died, and left the country in great disarray. If they correctly represented this diplomatically (starting wars, diplomatic relationship) this is going to be real tough right from the beginning.
Someone knows if Epirus and other greek states will have the sarissa phalanx or only macedon will and the rest will have hoplites ?